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Note 10 - Common Stock and Stock-based Compensation Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021
Outstanding, Number of shares (in shares) | [1] |  |  |  | 126,000 |  |
Outstanding, Weighted average exercise price (in dollars per share) |  |  |  |  | $ 20.06 |  |
Outstanding, Weighted average remaining contractual term (Year) |  |  |  |  | 2 years 6 months | [2] | 2 years 7 months 6 days
Outstanding, Aggregated intrinsic value |  | $ 1,438 | [2] |  | $ 1,438 | [2] | $ 2,921
Granted, Number of shares (in shares) |  | 0 |  | 0 | 0 | [1] |
Exercised, Number of shares (in shares) | [1] |  |  |  | (17,000) |  |
Exercised, Weighted average exercise price (in dollars per share) |  |  |  |  | $ 18.08 |  |
Forfeited or expired, Number of shares (in shares) | [1] |  |  |  | 0 |  |
Outstanding, Number of shares (in shares) | [1] | 109,000 | [2] |  | 109,000 | [2] | 126,000
Outstanding, Weighted average exercise price (in dollars per share) |  | $ 20.37 | [2] |  | $ 20.37 | [2] | $ 20.06
Exercisable, Number of shares (in shares) | [1],[3] | 109,000 |  |  | 109,000 |  |
Exercisable, Weighted average exercise price (in dollars per share) | [3] | $ 20.37 |  |  | $ 20.37 |  |
Exercisable, Weighted average remaining contractual term (Year) | [3] |  |  |  | 2 years 6 months |  |
Exercisable, Aggregated intrinsic value | [3] | $ 1,438 |  |  | $ 1,438 |  |
[1] | The SAR units are convertible for a maximum number of shares of the Company’s common stock equal to 75% of the SAR units subject to the grant.
[2] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 108,250 shares of the Company’s common stock issuable upon exercise.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 108,250 shares of the Company’s common stock issuable upon exercise.

X
- Definition Weighted average grant-date fair value of options and SARs exercisable. + References No definition available. + Details
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X
- Definition Gross number of share options and SARs granted during the period. + References No definition available. + Details
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- Definition Number of options and stock appreciation rights outstanding. + References No definition available. + Details
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- Definition Intrinsic value of options and SARs exercisable. + References No definition available. + Details
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- Definition Intrinsic value of options and SARs outstanding. + References No definition available. + Details
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- Definition Weighted average remaining contractual terms of options and SARs exercisable. + References No definition available. + Details
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- Definition Number of share options and SARs exercisable. + References No definition available. + Details
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- Definition Number of share options and SARs exercised during the current period. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options and SARs exercised during period. + References No definition available. + Details
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X
- Definition Number of share options and SARs forfeited or expired during the current period. + References No definition available. + Details
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- Definition Represents the weighted average remaining contractual term of options and SARs outstanding. + References No definition available. + Details
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